How should explosives be confined in a drill hole?

The correct method for confining explosives in a drill hole is to use incombustible materials. This approach is essential for ensuring safety and effectiveness in blasting operations. Incombustible materials help to contain the explosive energy, directing it more efficiently towards breaking rock while minimizing the risk of accidental ignition or explosion of nearby materials.

Using incombustible materials creates a safer environment because they do not ignite or contribute to combustion risks in the event of an accidental discharge of the explosive. This method enhances the performance of the explosives by maximizing their efficiency during detonation while minimizing potential hazards to personnel and equipment.

While options like combustible materials or using any material available might seem feasible, they could introduce significant risks, such as unforeseen ignitions or inefficient blasting performance. Sand is often used, but it may not always be classified strictly as incombustible and doesn't always offer the same degree of safety and effectiveness. Therefore, confining explosives with incombustible material is the most recommended and safest practice in mining operations.